Definition

Acting inappropriately youthful and eccentric for your age, typically as a result of dating someone significantly younger; basically a midlife crisis disguised as charm.

Example Usage

Dude's 55 years old in a tank top doing TikTok dances with his 25-year-old girlfriend—total mortdecai move.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=mortdecai&defid=8070456)

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